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Sigma are a Japanese company which produce cameras, lenses and flashes. They're most widely known for their selection of lenses which are compatible with cameras from other manufacturers.

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Sigma 10-20mm f5.6 alternatives?

I've been wanting to add a wide angle lens to my collection for a while now. Sigma 10-20mm f5.6 looks good. I was looking at it about 2 years ago. I was wondering if there have been newer wide angle ...
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Which lens is sharper? The Sigma 18-50mm f2.8 or the Tamron 17-50mm f2.8?

Specifically: Sigma 18-50mm f/2.8 EX DC Macro (not the previous non-macro version. HSM is only on Nikon fit) Vs. Tamron 17-50mm f2.8 SP XR Di II LD VC Lens (not the cheaper one without vibration ...
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Are Sigma lenses comparable to Canon lenses for a Canon camera?

I always feel that I should buy a Canon lens for my Canon camera, and Sigma would just be a cheap knock-off. Is that the case?